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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>Document</title>
</head>

<body>
    <!--块元素(行元素)  单独占一行-->
    <div>我是div标签</div>
    <p>我是p标签</p>
    <h1>我是h1标签</h1>
    <hr />
    <!--内联元素(行内元素)  排成一行-->
    <a href="">我是a标签</a>
    <span>我是span标签</span>
    <img src="./images/no_data.jpg" alt="我是img标签">
</body>

</html>